<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */

/**
 * Smarty {html_image} function plugin
 *
 * Type:     function<br>
 * Name:     html_image<br>
 * Date:     Feb 24, 2003<br>
 * Purpose:  format HTML tags for the image<br>
 * Input:<br>
 * - file = file (and path) of image (required)
 * - height = image height (optional, default actual height)
 * - width = image width (optional, default actual width)
 * - basedir = base directory for absolute paths, default
 * is environment variable DOCUMENT_ROOT
 * - path_prefix = prefix for path output (optional, default empty)
 *
 * Examples: {html_image file="/images/masthead.gif"}
 * Output:   <img src="/images/masthead.gif" width=400 height=23>
 * @link http://smarty.php.net/manual/en/language.function.html.image.php {html_image}
 * (Smarty online manual)
 * @author   Monte Ohrt <monte at ohrt dot com>
 * @author credits to Duda <duda@big.hu> - wrote first image function
 * in repository, helped with lots of functionality
 * @version  1.0
 * @param array
 * @param Smarty
 * @return string
 * @uses smarty_function_escape_special_chars()
 */
function smarty_function_html_image($params, &$smarty) {
	require_once $smarty->_get_plugin_filepath ( 'shared', 'escape_special_chars' );
	
	$alt = '';
	$file = '';
	$height = '';
	$width = '';
	$extra = '';
	$prefix = '';
	$suffix = '';
	$path_prefix = '';
	$server_vars = ($smarty->request_use_auto_globals) ? $_SERVER : $GLOBALS ['HTTP_SERVER_VARS'];
	$basedir = isset ( $server_vars ['DOCUMENT_ROOT'] ) ? $server_vars ['DOCUMENT_ROOT'] : '';
	foreach ( $params as $_key => $_val ) {
		switch ($_key) {
			case 'file' :
			case 'height' :
			case 'width' :
			case 'dpi' :
			case 'path_prefix' :
			case 'basedir' :
				$$_key = $_val;
				break;
			
			case 'alt' :
				if (! is_array ( $_val )) {
					$$_key = smarty_function_escape_special_chars ( $_val );
				} else {
					$smarty->trigger_error ( "html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE );
				}
				break;
			
			case 'link' :
			case 'href' :
				$prefix = '<a href="' . $_val . '">';
				$suffix = '</a>';
				break;
			
			default :
				if (! is_array ( $_val )) {
					$extra .= ' ' . $_key . '="' . smarty_function_escape_special_chars ( $_val ) . '"';
				} else {
					$smarty->trigger_error ( "html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE );
				}
				break;
		}
	}
	
	if (empty ( $file )) {
		$smarty->trigger_error ( "html_image: missing 'file' parameter", E_USER_NOTICE );
		return;
	}
	
	if (substr ( $file, 0, 1 ) == '/') {
		$_image_path = $basedir . $file;
	} else {
		$_image_path = $file;
	}
	
	if (! isset ( $params ['width'] ) || ! isset ( $params ['height'] )) {
		if (! $_image_data = @getimagesize ( $_image_path )) {
			if (! file_exists ( $_image_path )) {
				$smarty->trigger_error ( "html_image: unable to find '$_image_path'", E_USER_NOTICE );
				return;
			} else if (! is_readable ( $_image_path )) {
				$smarty->trigger_error ( "html_image: unable to read '$_image_path'", E_USER_NOTICE );
				return;
			} else {
				$smarty->trigger_error ( "html_image: '$_image_path' is not a valid image file", E_USER_NOTICE );
				return;
			}
		}
		if ($smarty->security && ($_params = array ('resource_type' => 'file', 'resource_name' => $_image_path )) && (require_once (SMARTY_CORE_DIR . 'core.is_secure.php')) && (! smarty_core_is_secure ( $_params, $smarty ))) {
			$smarty->trigger_error ( "html_image: (secure) '$_image_path' not in secure directory", E_USER_NOTICE );
		}
		
		if (! isset ( $params ['width'] )) {
			$width = $_image_data [0];
		}
		if (! isset ( $params ['height'] )) {
			$height = $_image_data [1];
		}
	
	}
	
	if (isset ( $params ['dpi'] )) {
		if (strstr ( $server_vars ['HTTP_USER_AGENT'], 'Mac' )) {
			$dpi_default = 72;
		} else {
			$dpi_default = 96;
		}
		$_resize = $dpi_default / $params ['dpi'];
		$width = round ( $width * $_resize );
		$height = round ( $height * $_resize );
	}
	
	return $prefix . '<img src="' . $path_prefix . $file . '" alt="' . $alt . '" width="' . $width . '" height="' . $height . '"' . $extra . ' />' . $suffix;
}

/* vim: set expandtab: */

?>
